ORCA SLICER · ~1–2 HOURS · ONCE PER FILAMENT
Calibrating a New Filament
Five tests, done in the right order, that turn a generic preset into clean, strong and noticeably faster prints — in Orca Slicer, on any printer.
First time? Start by drying your filament →If you only do two, do these: Pressure Advance and Flow Rate. They fix the majority of quality problems. The rest sharpen the result — do as many as you have patience for.
Why bother calibrating
A generic filament preset is a starting point, not an answer. The same filament behaves differently on every machine, nozzle and extruder — so out of the box you're usually a few percent off on flow, running a retraction distance that strings, and leaving real print speed unused.
Calibration locks in the five variables that decide print quality: temperature, flow, pressure response, line width and retraction. Do it once per filament and you get cleaner walls, sharp corners, stronger parts and — because you've found the true flow limit — meaningfully faster prints.
Before you start
Dry filament first. Wet filament invalidates every test below. Dry it and keep it sealed with desiccant — see the Filament Care Hub.
Set up Orca Slicer. Select your correct printer and standard print profile, and the right filament preset — your brand preset if it exists, otherwise the matching generic one (e.g. Generic PLA).
Find the Calibration menu (top-left). If it's not there, enable advanced settings or turn on develop mode in Preferences.
Do the tests in order. Each result feeds the next, so don't skip ahead.
THE GOLDEN SAVE RULE
After every test, open a fresh project so no test geometry or stray settings get saved. Enter only the result into Filament Settings, and save it under a name tied to that exact filament.
THE WALKTHROUGH
The five tests, in order
Nozzle temperature
Sets strength, surface finish, stringing and overhang quality.
WHAT IT DOES
Every filament has a temperature window. Too cool and layers don't bond — weak, rough prints. Too hot and you get stringing and droopy detail. You're looking for the all-round sweet spot, and leaning to the warmer end of it, because hotter generally means stronger parts and more flow headroom for speed later.
IN ORCA
- a.Quick version — use the middle of the temperature range printed on the spool or in the filament data sheet.
- b.Best version — Calibration → Temperature tower. Pick your filament type (or enter a custom range) to auto-generate the tower; each block prints 5 °C cooler as it goes up.
- c.Slice, send or export, and print. Lighting it from above makes every line and defect visible.
HOW TO READ IT
Compare the blocks for clean walls, minimal stringing, crisp small detail and good overhangs — each peaks at a different temperature, so pick the best all-rounder. Within an acceptable band, choose the higher temperature for stronger parts.
SAVE IT
Open a new project → Filament Settings → enter the temperature → Save under a name tied to that exact filament.
EXAMPLE READING
In the source walkthrough, ~215–220 °C won for one matte PLA. That's an illustration, not a target — yours will differ.
COMMON MISTAKE
Picking purely the lowest ‘clean’ temperature. It looks fine, but quietly costs you layer adhesion and strength.
Max volumetric flow
ESSENTIALThe real speed limit — how fast filament can melt and extrude cleanly (mm³/s).
WHAT IT DOES
This is the single biggest factor in print speed. Your printer automatically slows any move that would exceed this flow rate, so a value set too low quietly caps your speed, and one set too high causes under-extrusion and clogs.
IN ORCA
- a.Calibration → Max flow rate. Keep the default test range for most filaments (TPU usually needs lower; only rare high-flow filaments go above 20).
- b.Generate, send or export, and print.
HOW TO READ IT
Find the first layer where defects start — rough patches, gaps, or a change in surface sheen (a sheen change means the material is starting to degrade). Measure the height from the bottom to that point. In the slicer preview, switch the view to Flow, drag the slider to that height and read the flow value. Subtract 10–20% for safety — that's your number.
SAVE IT
New project → Filament Settings → enter the max volumetric speed (at the bottom) → Save.
EXAMPLE READING
Example from the source: first defect at 33 mm → 21.4 mm³/s there → minus a safety margin → 17 mm³/s. That was a ~40% speed gain over the 12 mm³/s default.
COMMON MISTAKE
Trusting the generic preset value. Most are conservative and leave a lot of speed on the table; a few are optimistic and cause under-extrusion.
Pressure advance
ESSENTIALKeeps extrusion even through corners and speed changes — no blobs, no gaps.
WHAT IT DOES
As the toolhead accelerates and decelerates, nozzle pressure lags behind. Pressure advance compensates, so corners stay sharp and lines stay uniform instead of bulging or thinning. It's the setting most people get wrong.
IN ORCA
- a.Calibration → Pressure advance. Choose your extruder type, then the PA Pattern test (avoid PA Tower — hard to read — and PA Line — too build-plate dependent). The default range is usually fine; TPU can go up to 0.5.
- b.Set the test's speed and acceleration to the values your prints actually use — your outer-wall speed and acceleration. This is the step the pros skip.
- c.Turn OFF any automatic pressure-advance calibration, then print.
HOW TO READ IT
Find the corner that is both gap-free and sharp, then follow that line down to read its pressure-advance value. In-between values are fair game if two look equally good.
SAVE IT
New project → Filament Settings → enable Pressure advance → enter the value → Save.
IN BAMBU STUDIO
In Bambu Studio this is called factor K: Calibration → Manage results → add the filament and K value, then Device → Edit filament → set the K value.
COMMON MISTAKE
Running the test at the wrong speed/accel. A PA value is only correct for the speed and acceleration it was measured at. If your max flow is low, the printer never reaches outer-wall speed — make a large test cube, slice it, read the actual outer-wall speed in the Speed view, and use THAT. Then set all your print speeds and accelerations to the calibrated values (except top layers) so the value stays valid.
Flow ratio
How much filament makes a correct-width line — the biggest lever on surface quality.
WHAT IT DOES
Too much filament and lines overlap and bulge (over-extrusion); too little and gaps open up between them. Getting this right is what makes top surfaces and walls genuinely clean.
IN ORCA
- ›Calibration → Flow rate, and use the ‘YOLO’ test (recommended — or the perfectionist smaller-step version). Make sure automatic flow calibration is disabled, then print.
HOW TO READ IT
You get 11 samples. Skip the over-extruded ones (too glossy or raised) and the ones with gaps. Pick the sample with a smooth surface and no gaps between lines — a faint main ring is fine. Choose an in-between value if two are close.
SAVE IT
New project → Filament Settings → adjust the flow ratio by the chosen amount → Save. If even the extremes aren't enough, add 0.05 to the base flow ratio and run the test again.
EXAMPLE READING
Example: −0.02 looked near-perfect and −0.03 had tiny gaps, so −0.025 was chosen — i.e. a 0.955 flow ratio.
COMMON MISTAKE
Do NOT use the calliper single-wall method. It also picks up layer wobble and inconsistent extrusion, and is extremely sensitive to measurement error. The printed flow test is far more reliable. (This supersedes the calliper step in our older Tuning and Documenting Slicer Profiles guide.)
Retraction distance
How far filament pulls back between moves — clean line starts and ends, no strings.
WHAT IT DOES
Often overlooked, but it's the difference between clean travel moves and a web of strings and blobs across your print.
IN ORCA
- a.Calibration → Retraction test. Direct-drive extruders can leave the defaults; Bowden setups should set the end value to 6 mm and increase the step to keep the print short.
- b.Print it — retraction distance increases with each ring.
HOW TO READ IT
Find the lowest ring with no stringing or oozing and a clean seam. Keep it as low as possible — too much retraction can punch tiny holes in the outer wall that look exactly like wet-filament defects — but never zero. Read the exact retraction length from the G-code preview at that ring height.
SAVE IT
New project → Filament Settings → Settings override → enter the retraction length → Save.
Prove it worked
Print a calibration cube with your new profile and another with the default, using the same print profile and with don't slow down outer walls enabled so the comparison is fair.
You should see cleaner layer lines (flow ratio), sharp corners (pressure advance), a smoother top surface, stronger parts (temperature) and a noticeably faster print (max flow). On a difficult filament like TPU the difference can be the gap between unprintable and excellent.
Keep it dialled in
- Calibration is specific to your machine, nozzle and extruder. Don't copy values off the internet — including the examples above.
- The same brand in a different colour is usually close, but not guaranteed. A different brand always needs its own pass.
- You only calibrate a filament once. After that, keep the printer's automatic calibrations turned off so they don't override your values.
- Every setting here exists in any slicer — only the names change.
DON'T WANT TO DO THIS YOURSELF?
Where we can help
PROFILES
Pre-calibrated STANDARD PRINT CO. profiles
Buy filament from us and the profile is already dialled in for the 0.4 mm nozzle. Skip the testing entirely.
Get the profilesSERVICE
Recalibration Service
We restore print quality and dimensional accuracy to spec after wear, a component swap, or a move.
Book a recalibrationTRAINING
Slice & Print training
Hands-on calibration training — temp towers, flow, pressure advance and retraction — on your real machines.
See trainingGet this as a PDF
Email hello@standardprintco.com.au with the subject "Filament Calibration Guide PDF" and we'll send a formatted copy for the workshop wall.
Dry, store and handle filament — do this before you calibrate.
Once you can calibrate one filament, systematise it across a team.
The concepts behind the settings you just tuned.
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